/// MIT License
/// 
/// Copyright (c) 2020 ManBang Group
/// Permission is hereby granted, free of charge, to any person obtaining a copy
/// of this software and associated documentation files (the "Software"), to deal
/// in the Software without restriction, including without limitation the rights
/// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
/// copies of the Software, and to permit persons to whom the Software is
/// furnished to do so, subject to the following conditions:
/// 
/// The above copyright notice and this permission notice shall be included in all
/// copies or substantial portions of the Software.
/// 
/// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
/// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
/// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
/// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
/// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
/// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
/// SOFTWARE.

class _Bus {
  Map<String, Function> pool = {};
  int busId = 0;

  dynamic register(Function callback, [ String name ]) {
    dynamic busName = name ?? (++busId).toString();
    if (!has(busName)) {
      pool[busName] = callback;
      return busName; 
    }
    // else {
    //   Util.onError(ThreshError('Register Bus Error: bus name: "$busName" is already exist'));
    // }
  }

  fire(String name, { dynamic args }) {
    if (!has(name)) return;
    Function cb = pool[name];
    if (args == null) cb();
    else cb(args);
  }

  has(String name) {
    return !!(name != null && pool[name] != null);
  }

  remove(String name) {
    if (!has(name)) return;
    pool.remove(name);
  }
}

_Bus bus = _Bus();
